Add Findbugs reporting (#362)
Add Findbugs reporting (#362)

amaliujia/lenskit,aglne/lenskit,linjunleo/lenskit,chrysalag/lenskit,binweiwu/lenskit,kluver/lenskit,martinlaz/lenskit,kluver/lenskit,kluver/lenskit,tajinder-txstate/lenskit,aglne/lenskit,blankazucenalg/lenskit,binweiwu/lenskit,martinlaz/lenskit,vijayvani/Lenskit,tajinder-txstate/lenskit,chrysalag/lenskit,blankazucenalg/lenskit,vaibhav345/lenskit,tajinder-txstate/lenskit,vaibhav345/lenskit,tajinder-txstate/lenskit,kluver/lenskit,vijayvani/Lenskit,amaliujia/lenskit,vaibhav345/lenskit,linjunleo/lenskit,vaibhav345/lenskit,kluver/lenskit